Sound-intensifier for telephones.



W. -HOPPIH SOUND INTENSIPIER POR TELEPHONES.

' APPLICATION FILED MAY 24, 1909.

1,012,854. Patented Deo. 26, 1911.

`clamped between UNTTED STATES PATENT oEEToE.

WILLIAM HOPPIE, 0F OGDN, UTAH, A-SSIGNOR OF ONE-FOURTH T0 WILLIAM COUNTS,

0F SPARKS, NEVADA, AND ONE-FOURTH TO ALBERT `G .HORIL 0F OG-DEN, UTAH.

SOUND-INTENSIFIER FOR TELEPHONE-S.

To all inkom it may concern: V

Be it known that I, VVTLLIAM Herrin, of Ogden city, in the county of Weber and State of Utah, have invented certain new and useful Improvements in Sound-Intensiers for Telephones; and I do hereby de- Clare the following to be a full, clear, and exact description of will enable others skilled in the art to which it appertains to make and use the same.

-The principal object of this invention is to etfectually intensify soun'ds transmitted over telephoneA circuits 'and to do this in such manner as to free them of thevusual lnetallic sounds.

In order to more fully describe my invention, reference will be had to the ac-i companying drawings wherein,

Figure l is a section on line 1*-1, Fig. 2, looking down and showing the magnets in dotted lines. Fig. 2 is a vertical section of the entire device on line 2-2, Fig. 1.I Fig. 3 is a section'on line 3 3, Fig.` 2, looking down. Fig. 4 represents, in side elevation, the operating parts of the device removed from the inclosing casing. Fig. 5 is a detail perspective view of the lever mechanism for intensifying the sound.

The form of the invention shown comprises, among other parts, a diaphragm a of suitable magnetic metal, referably a thin sheet of ferrotype, and is supported by being clamped between two rings t, t, of fiber or other suitable material, supported upon screws Ic, 7c, which are in turn supported upon a base j of fiber or other suitable material. i Mounted above the diaphragm a is a second diaphragm f which may be of any suitable lmaterial for transmitting or reproducing sound. This second diaphragm is supported by being two fiber lor other suitable rings 2'., z', which are shown as being clamped between nuts of the supporting screws c, c. Located between the two diaphragms in a system of levers for mechanically transmitting, with increased amplitude, the vibrations of diaphragm a to diaphragm This system ot levers comprises, among other parts, two small arms Z) and c, cach having one end rigidly connected respectively to the diaphragms a and The other ends of these arms are pivoted respectively to the ends of a small lever c which is fulcrumed between its Specification of Letters Patent. Application led May 24, 1909. Serial No. 497,980.

the invention, such as' Patented Dec.

connectionswith arms b and e to depending arm d on aI balancing lever g pivoted at one end to a plate g rigidly secured by means of screw 'v to the supporting rings 5,. z'. The end of this lever, opposite its pivotal support, is provided withv an extension which passes between the side members and 'rests upon the yoke of a staple h supported `for vertical adjustment in the' l rings z', i. By varying theheight of this staple h theweight of the arm g on the lever c may be varied and thereby made to Aregulate the de ice. The sound may also be governed by regulating the Weight and size of t-he arm g. The metallic sounds usually accompanying sound transmission are completely eliminated by the arm g at- 'taclied to t-he lever which acts as a neutralizer.

The initial vibration is imparted to the diaphragm a by means of electro-magnets m, m, connected by circular permanent magnet yoke p and mounted upon the base plate y as a support. these magnets are connected to terminal T-he windings of binding posts n, n, over which pass wires w, w, of the telephone circuit or other circuit used to energize the magnets m, m.

Thel parts above described are inclosed in a suitable casing a having a cover Z secured to the rings i, z', by means of screws s. This cover has an opening in its top which may be provided with a screw threaded {iange u to be secured to a tube, megaphone or other sound conveying means. l

While I have herein described one specie embodiment'of my said invention, I do not Wish to be understood as. limiting my invention to this specic form alone.

I claim as my invention 1. A sound intensifier for telephones comprising two or phragms, electrical means adapted to initially vibrate one of said diaphragms, alever pivoted to each of said diaphragms, a weighted level' pivoted to a rigid support and supported at its opposite end,- said lever forming a fulcrum for the first mentioned lever at a point between its attachment to said diaphragms, and means to limit the gravitating effect of the second mentioned lever upon the lever of which it forms a supporting fulcrum.

more vibratory dia 'comprising two or more` vibratory dia'- phragms, a lever pivotally connected coadjacent diaphragms, a weighted lever pivotally connected 'at one end to a rigid supf port and forming a fulcrum forl the first mentioned lever, an adjustable support for the other end of vsuch lever for regulating the gravitating'eil'ect of the second men- "liloned lever upon the lever of which it vtjorms a supporting fulcrum, and means to impart initial .vibration to one of said diaphragme.

Weighted lever pivoted to a rigid support and forming a fulcrum for the first inent-ioned lever at a point between its attachment to said diaphragme, and means for adjustably supporting said lever at the end opposite its pivoted end for regulating the gravitating eHeet of the second mentioned lever upon the lever of which it forms a supporting fulcrum. l

In testimony whereof have signed this specicationin the presence of subscribing WILLIAM HOPPIE.

1 Witnesses.V 3. A sound intensifier for telephones Witnesses:

CARL C. RAsMUssoN, GLADYS MORGAN, A. G. HORN. 

